Corner bending and forming press.



N0. 629,4l2. v Patented July 25, I899. F. WUELFING.

CORNER BENDING AND FORMING PRESS.

(Application filed Mar. 20, 1899.)

(No Model.)

life/ages.

NITED ST ES PATENT FFICE.

FREDRICK WUELFING, OF PONTIAC, MICHIGAN.

CORN ER BENDING AND FORMlN G PRESS.

SPECIFICATION forming part of Letters Patent N 0. 629,412, dated July 25, 1899.

Application filed March 20 1 8 9 9.

To all whom it may concern:

Be it known that I, FREDRICK WUELFING, a citizen of the United States of America, residing at Pontiac, in the county of Oakland and State of Michigan, have in vented certain new and useful Improvements in Corner Bend ing and Forming Presses, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention is particularly designed for forming the corners of buggy-irons used in the manufacture of the wooden bodies of vehicles and for like work and for which thin steel bars of plano-convex, half oval, or like cross-section are used.

To this end my invention consists in a press having fixed and movable dies adapted to bend a bar of such cross-section in the plane of its flat side and form a corner similar to'the miter-joint in woodwork, all as more fully hereinafter described and shown in the accompanying drawings, in which Figure 1 is a perspective view of my press with the power-lever partly broken away. Fig. 2 is a plan view thereof, showing the jaws carrying the movable dies closed, as in operation. Fig. 3 is a section on line a: 00, Fig. 2. Fig. 4 is a section on line y 2 Fig. 2. Fig. 5 is a detached perspective view of the two movable jaws with the cheek-plates removed. Fig. 6 is a perspective view of the corner-iron made by the press.

A is a bed-plate which supports all the parts. It is provided with suitable means for securing it to a table or other foundation, the drawings showing for this purpose a lug Ct for clamping it in a vise.

B is a fixed corner jaw or die-block secured 1i pon the bed-plate. It has two faces at right angles to each other, each of which has a groove 1), adapted to receive edgewise onehalf of a bar of plano-convex cross-section. The flat side of each groove is formed on'the die-block itself,.and the other or concave sides are formed by cheek-plates c, detachably secured to the die-block and 1niter-joint-.- ed at the corner.

D D are two movable jaws or die-blocks articulated together at their inner ends by means of overlapping knuckles, through which passes the fulcrum or pivot pin E, which is fast in the bed-plate. Each of these Serial No. 709,711. (No model.)

movable jaws has formed in its face a groove 1), corresponding to the groove in the faces of the corner-jaw and with the concave side of the groove formed in like manner by means of detachable cheek-plates c, cutaway at both jaws at the inner ends to permit the closing of the jaws together upon the corner jaw, while the fiat side is formed on the body of the jaws in such manner that it ispractically continuous through both jaws in any position thereof. The two movable jaws are pivotally connected at cl (1' to the opposite ends of a toggle-lever F, which at its joint is connected by a pivot-pin e to a power-lever G, fulcrumed at f upon the bed-plate.

The parts being constructed and arranged as described and shown, they operate as fol- .lows: When the lever is turned in the position shown in Fig. 1, the two movable jaws are opened to their full extent, and the groove in one jaw is in direct line with the groove in the other jaw. By turning the lever in the direction which closes these jaws both move toward the corresponding faces of the fixed jaw, and when fully closed the jaws come di-- rectly together in such manner that the grooves in the movable jaws complement the groove in the faces of the fixed jaw and form a single continuous closed groove on both sides and on the corner of the angle, the cheeks o of the movable jaws being just sufficiently cut away near the fulcrum to come together.

In addition to the parts above described I preferably provide a plate H, which is secured at the angle of the fixed jaw and projects into the movable jaws. The surface of this plate is on a level with the fiat side of the grooves in the jaws, and to permit a perfoot closing of the movable jaws the same are sufficiently cut away at the inner ends on the flat sides of the grooves, as shown at g g, '5, to admit the part of the plate projecting out from the fixed jaw.

In practice the bar is first heated at the point to be bent and then inserted into the movable jaws while they are open, so that the bar enters into the jaws to the depth of IOO side with a rest Jfor the bar.

After the bar is thus properly inserted the workman closes the jaws by means of the lever. In so doing the bar is immediately engaged into the groove of the fixed die at the point of the angle, and by the further movement it is bent at the angle, and when the jaws come together it will be formed with the perfect angular corner shown in Fig. 6.

The plate H bridges the space in the angle between the jaws, and it extends sufficiently into the joint to cover over the clearance required to be made at the point of the jaw D to allow the two jaws to close upon the stationary jaw. The plate l-I thus maintains during the whole operation the continuity of the lower or flat side of the groove across the joint between the two movable jaws, as well as across the whole corner, as at the point where the angle is formed the heated material is displaced in the operation and has a tendency to swell out and force itself into whatever clearance it may find at the corner. It will be readily seen that the plate H prevents the formation of any fin or roughness on the flat side of the corner, which would require subsequent filing and smoothing. It will also be seen that the plate H materially assists in the perfect closing of the jaws and further permits of placing the movable jaws sufiiciently away from the fixed jaw to make it convenient to insert the bar and remove it after the work is done.

The bar may be inserted in my machine from either side, (the stop and rest being interchangeable,) and thus another corner may be bent in either one of the legs of the corneriron. My machine is thus adapted not only to form single corners, butalso to form buggyirons with two corners. t is also obvious that the separate and removable cheek-pieces permit of changing the form of the groove in the jaws and adapt the machine for other cross-sections of bars of like character, and if for any particular work angles of less or more than ninety degrees should be required the same construction can be used, requiring only a change in the angle.

That I claim as my invention is- 1. In a corner bending and forming press, the combination with a bed-plate, of a fixed corner-jaw formed with a continuous groove in its faces in the plane of the jaw, two mov able jaws articulated together upon a f nlcru mpin on the bed-plate and having faces adapted to close against the faces of the fixed corner-jaw, grooves in said jaws complementary to the grooves in the corner-jaw means for closing and opening said movable jaws, and

tween the fixed and movable jaws and forming one of the sides of the grooves therein continuously between the jaws.

2. In a corner bending and forming press, the combination with a bed-plate, of a fixed corner-jaw, two movable jaws articulated together upon a fulcrum-pin on the bed-plate and adapted to close with their faces against the faces of the corner-jaw and to be extended in line with each other complementary grooves formed in the faces of the fixed and movable jaws adapted to form a corner-matrix for a bar of plano-convex crosssection when the jaws are closed together, and a fixed bridging-plate projecting from the corner of the fixed jaw intothe movable jaw and forming the flat side of thegrooves continuously in the corner of the jaws.

3. In a corner bending and forming press, the combination with a bedplate, of a fixed right-angle corner-jaw, two movable jaws articulated together upon a fulcrum-pin on the bed-plate and adapted to close with their faces against the faces of the corner-jaw, and to be extended in line with each other, means for closing and extending said jaws, complementary grooves formed in the faces of the fixed and movable jaws, one side of said grooves being fiat and in the plane of the jaws, and the other side being concave and formed by separate cheek-pieces and a fixed bridge-plate having its surface on a level with the flat sides of the grooves and extending from the' fixed jaws into the movable jaws.

4. In a corner bending and forming press, the combination with the bed-plate, of a fixed right-angle corner-jaw B the movable jaws D D, the fulcrum-pin E upon which said jaws rare articulated, the complementary grooves 19 1) formed continuously in the faces of the fixed and movable jaws, one side of said grooves being fiat and in the plane of thejaws and the other side being concave, the separate cheek-pieces forming the concave side of the grooves, the bridge-plate H in the angle between the jaws on a level with the fiat side of the grooves, the toggledever pivotally secured at opposite ends to the movable jaws, and the power-leverfor actuating the movable jaws.

In testimony whereof I aflix my signature.

in presence of two witnesses.

FREDRICK WUELFING. Witnesses:

OTTo F. BARTHEL, V. D. KINNER. 

